Between 2014 and 2015, the Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers industry saw employment growth of only 2.96%. There are an average of 12 workers at each of the 5,096 establishments in the United States. With OSHA reported accident rates of less than that of the the Hardware and Plumbing and Heating Equipment and Supplies Merchant Wholesalers Industry as a whole, things have been relatively safe over the past five years.